Gravel, Stone and Soil for Latah County, ID

Idaho Rock Supply handles gravel, stone and aggregate delivery in Latah County, ID. Road mix is the base material this ground is built on, and it is the load most drives, shop pads and shed slabs start from.

The county sits on deep windblown loess over Columbia River basalt, ground that sheds water rather than taking it in. That shapes what you order and how much of it you need underneath.

Delivery across Latah County

You order online, pick a quantity by the ton or by the yard, and a dump truck tips the load on site. Each product page has a calculator if you want to size the load before checkout.

Choose a delivery date at checkout and the truck arrives with your material. It tips the pile where the truck can reach, and that is the whole of it.

Coverage runs across the county, including Moscow, Genesee, Troy, Potlatch, Juliaetta, Deary, Kendrick, Princeton, Viola and Harvard. Rural approaches and in-town pads both take a bulk dump delivery.

Materials delivered in Latah County

Lead with the job. A driveway takes a compacted base and a surfacing layer, a patio takes bedding sand or chips, and a drain takes clean washed rock.

Road mix is the one to know by name. It is crushed base with the fines left in, and Idaho yards call it road mix, 3/4 road mix or 3/4 minus.

Ask for 3/4 minus and you get the same load.

On public works plans the same material is written as crushed aggregate, Type I or Type II. State highway work follows the ITD Standard Specifications, where Section 703.04 covers aggregate for untreated base and road mix and Section 703.11 covers granular subbase.

City, county and highway district jobs usually follow the Idaho Standards for Public Works Construction, Section 802 for crushed aggregate and Section 801 for uncrushed.

For a drive, road mix goes down as the base and driveway gravel surfaces it. For a patio, mason sand or stone screenings bed the pavers.

For drainage, #57 Stone and #4 Crushed Stone both work, though Idaho yards usually ask for drain rock by inch size. RipRap armors creek banks and culvert outlets.

Ground conditions across Latah County

Across the Palouse hills and the Clearwater and Snake canyons, the ground is deep windblown loess, in places tens of feet thick, lying on Columbia River basalt. Silt loam over loess seals under rain and sheds water instead of taking it in.

Long slopes push that runoff onto roads, drives and yards, and water perches where the loess sits on basalt. An under-built base on this ground fails from the bottom up.

Sheet and rill erosion on cropped loess slopes here is among the heaviest anywhere in the country. Canyon roads, culverts and creek banks scour under spring runoff and summer cloudbursts.

Sticky loess mud through the wet months is the real constraint on hauling and compaction. Late spring through fall is the workable window for both.

Winters on the prairie are cold and wet with frequent freeze and thaw. No published frost depth figure was found for Latah County, and Idaho code leaves the frost line to the local jurisdiction, so the building official sets it.

Choosing the right material

Comparing ground helps. Nez Perce County and Clearwater County share this same ground region, deep loess over basalt with canyon rimrock and talus.

Material choices there work the same way they do here.

Benewah County sits on different ground. Its uplands carry volcanic ash over windblown loess with a dense fragipan below, glacial till on the ridges, and deep flood-laid sand, gravel and cobbles on the Rathdrum Prairie.

That fragipan matters. It is a tight layer that perch water, so drainage there has to move water sideways and away rather than down.

Loess over basalt sheds water at the surface instead, which puts the weight on slope and surface control.

Order road mix for the base under a drive, a parking pad, a shop floor or a shed slab. Pit run goes below it as sub base or structural fill, and driveway gravel surfaces the top.

Order drain rock for a french drain, a foundation drain, a drywell or a downspout run, and 3/4 inch crushed rock for pipe bedding. Order 3/8 chip for a path, Natural Pea Gravel for a patio, and rip rap for a bank that scours.

Order road mix for your Latah County project

Road mix is the base this county builds on, and Idaho Rock Supply delivers it across Latah County along with drain rock, chips, sand, topsoil and rip rap. Order online by the ton or yard, pick your delivery date, and the truck brings it to the site.